The effect of frequency on the dielectric strength of epoxy resin and epoxy resin based nanocomposites

In this study, the relative permittivity, dielectric loss and breakdown strength of epoxy resin and epoxy-hBN (hexagonal Boron Nitride) nanocomposites are studied under two different frequencies: 50 Hz and 1500 Hz. The effect of fill grade of the nanoparticles on the dielectric properties of the nanocomposites is also included. The following fill grades are investigated: 0.2 vol.%, 1 vol.% and 5 vol.%. The results indicate that the higher frequency (1500 Hz) affects the breakdown strength of the samples. The influence changes with the change of the filler concentration. The dielectric loss values of epoxy resin and epoxy-hBN nanocomposites show a significant increase with the increase of frequency. The decrease of the breakdown strength is in line with the increase of the tanô.